Offshore wind turbine pipe pile section increasing-solidified soil scouring protection structure and construction method

Abstract

The invention relates to an offshore wind turbine tubular pile section increasing-solidified soil scouring protection structure and a construction method. The construction method comprises the following steps of installing and fixing a solidified soil pouring device, installing a double-layer steel sleeve, installing a grouting pipe, injecting micro-expansion cement paste and driving a reinforcing steel pile. The solidified soil pouring device has the beneficial effects that through multi-pipe synchronous pouring, the pouring efficiency of solidified soil can be effectively improved, the outer hoop rotates along the fan pipe pile, and the solidified soil can be leveled; besides, the flow of solidified soil in the pouring pipe can be reasonably controlled according to the depth of the scour pit detected by the ultra-deep probe, the flatness of the scour pit after filling is guaranteed, and a stable and reliable foundation is provided for later installation of a pile bottom protection structure; the pile bottom protection structure is arranged at the pile bottom of the fan pipe pile, the sectional area of the pile bottom of the fan pipe pile is increased, the bottom of the fan pipe pile can be effectively reinforced, pipe pile damage caused by early-stage scouring is repaired, and the service life of the fan pipe pile is prolonged.

Description

Technical Field

[0001] The invention belongs to the field of offshore wind turbine pipe pile scour reinforcement construction, and in particular relates to an offshore wind turbine pipe pile enlarged cross-section-solidified soil scour protection structure and a construction method. Background Art

[0002] Under the long-term scouring effect of the ocean current, scouring pits are formed on the seabed at the bottom of the offshore wind turbine piles, affecting the safety of the wind turbine piles. In addition, once the scouring pits are formed, it is easy to further intensify the scouring effect, thereby affecting the structural safety of the wind turbine piles. Therefore, how to effectively reinforce the wind turbine piles is the key to ensuring the smooth operation of offshore wind farms.

[0003] Existing reinforcement technologies mainly include pouring solidified soil around wind turbine pipe piles, dumping gravel, laying solidified soil blankets and other measures. Although this method can effectively prevent the expansion of scour pits, it is not very effective in reinforcing wind turbine pipe piles with damaged structures. In addition, the flatness of underwater poured solidified soil is poor, and the construction quality is difficult to guarantee. Under the scouring action of water flow, the poured solidified soil is easily washed away. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide an offshore wind turbine pipe pile enlarged cross-section-solidified soil scour protection structure and a construction method.

[0005] The construction method of the offshore wind turbine pipe pile enlarged cross-section-solidified soil scour protection structure includes the following construction steps: Step 1: Install and fix the solidified soil pouring device: install the solidified soil pouring device on the wind turbine pile, and pump the solidified soil into the scouring pit at the bottom of the seabed through the pouring pipe; Step 2: Double-layer steel sleeve installation: Put the double-layer steel sleeve in the pile bottom protection structure on the fan pile, weld the bottom plate at the bottom of the double-layer steel sleeve, install the steel mesh inside, and weld the top plate on the top; Step 3: Installation of grouting pipe: install the grouting pipe on the grouting hole of the top plate, extract the circular floating block, and sink the pile bottom protection structure into the seabed; Step 4: Injecting micro-expansion cement slurry: injecting micro-expansion cement slurry into the double-layer steel sleeve through the grouting pipe; Step 5: Driving reinforcement steel piles: Pass the reinforcement steel piles through the steel casing and drive them into the seabed.

[0006] Preferably, in step one: the solidified soil pouring device includes an inner hoop, an outer hoop, a support rod, a pulley and a positioning sleeve; the inner hoop is semicircular, and the two inner hoop are combined with the sleeve hoop on the fan pipe pile, and a channel steel track is arranged around the outer side of the inner hoop, and the outer hoop is in a circular ring shape, and then the outer hoop is sleeved on the outer side of the inner hoop, one end of the support rod is fixed to the outer hoop, and the other end is provided with a pulley, and the pulley is supported in the channel steel track, the positioning sleeve is vertically fixed to the support rod, and then the casting pipe is inserted into the water from the positioning sleeve respectively.

[0007] Preferably, in step one: the solidified soil pouring device also includes an ultrasonic probe, which is turned on to detect the depth of the scouring pit, and the pumping amount of the solidified soil in the pouring pipe is controlled according to the depth of the scouring pit, until the poured solidified soil in the scouring pit is flush with the seabed surface; the outer clamp is rotated along the wind turbine pipe pile until the scouring pit is filled and leveled, and then the solidified soil pouring device is removed from the wind turbine pipe pile.

[0008] Preferably, step two is specifically as follows: the pile bottom protection structure includes a double-layer steel sleeve, a bottom plate, a top plate and a steel casing, the double-layer steel sleeve, the bottom plate and the top plate each include two symmetrical semi-annular structures, and the outer end of each semi-annular structure of the double-layer steel sleeve is provided with a docking ear plate; the two symmetrical semi-annular double-layer steel sleeves are put on the fan pipe pile and temporarily fixed by the docking ear plate, and then the bottom plate is welded and fixed at the bottom of the double-layer steel sleeve, and the steel mesh is tied and installed in the double-layer steel sleeve; the top plate is welded to the top of the double-layer steel sleeve.

[0009] Preferably, a grouting hole is provided on the top plate, the grouting hole is connected to the grouting pipe, and the circular floating block is arranged in the steel casing. Step two specifically comprises: installing the grouting pipe on the grouting hole of the top plate, plugging and connecting the grouting pipe to the grouting hole, then pulling out the circular floating block in the steel casing, sinking the pile bottom protection structure into the seabed along the wind turbine pipe pile, and clamping it on the bottom of the wind turbine pipe pile.

[0010] Preferably, in step 4: the injection of the micro-expansive cement slurry follows the principle of dual control of pressure and flow rate, that is, until both the pressure and flow rate exceed the design values, the grouting operation is stopped and the grouting pipe is pulled out.

[0011] Preferably, in step five: after the micro-expanding cement slurry reaches the designed strength, the reinforcement steel piles are inserted into the steel casing, and the bottom ends of the reinforcement steel piles are driven into the seabed through the solidified soil in the scouring pit.

[0012] An offshore wind turbine pipe pile with increased cross-section and solidified soil scour protection structure is obtained by any of the above methods.

[0013] The beneficial effects of the present invention are: 1) The present invention proposes a solidified soil pouring device, which can effectively improve the pouring efficiency of the solidified soil through multi-tube synchronous pouring. The outer hoop rotates along the fan pipe pile, which is conducive to the leveling of the solidified soil. In addition, according to the depth of the scouring pit detected by the ultra-deep probe, the flow rate of the solidified soil in the pouring pipe can be reasonably controlled to ensure the flatness of the scouring pit after filling, providing a stable and reliable foundation for the installation of the pile bottom protection structure in the later stage.

[0014] 2) The present invention increases the cross-sectional area of ​​the bottom of the fan pipe pile by arranging a pile bottom protection structure at the bottom of the fan pipe pile, which can effectively reinforce the bottom of the fan pipe pile, repair the pipe pile damage caused by early scouring, and extend the service life of the fan pipe pile.

[0015] 3) The pile bottom protection structure of the present invention adopts a double-layer steel sleeve + steel mesh + micro-expansion cement slurry structure, which can effectively enhance the sleeve effect of the pile bottom protection structure on the wind turbine pipe pile and ensure the reinforcement effect.

[0016] 4) The present invention can effectively improve the bonding strength between the pile bottom protection structure and the seabed by driving a reinforced steel pile into the steel casing of the pile bottom protection structure, provide a stable and reliable support for the wind turbine piles, and ensure the structural safety of the wind turbine piles. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of pouring solidified soil in the blower pipe pile scouring pit; Figure 2 It is a top view of the scouring pit solidified soil pouring device; Figure 3 It is a schematic diagram of the pile bottom protection structure when no reinforcement steel piles are inserted; Figure 4 It is a schematic diagram of the pile bottom protection structure with reinforced steel piles inserted; Figure 5 It is a schematic diagram of the three-dimensional structure of a double-layer steel sleeve; Figure 6 is a schematic diagram of the three-dimensional structure of the top plate; Figure 7 It is a schematic diagram of the butt joint of double-layer steel sleeves; Figure 8 This is a schematic diagram of the steel mesh installation; Fig. 9 Schematic diagram of roof and grouting pipe installation; Fig.10 Schematic diagram of the three-dimensional structure of the pile bottom protection structure.

[0018] Explanation of the reference numerals: 11-wind turbine pipe pile, 12-seabed, 13-scouring pit, 21-inner clamp, 22-channel steel track, 23-outer clamp, 24-foam float, 25-support rod, 26-pulley, 27-positioning sleeve, 28-ultrasonic probe, 31-casting pipe, 32-solidified soil, 41-double-layer steel sleeve, 42-bottom plate, 43-top plate, 44-steel casing, 45-circular float, 46-docking ear plate, 47-grouting hole, 48-steel mesh, 51-grouting pipe, 52-micro-expansion cement slurry, 6-reinforced steel pile. DETAILED DESCRIPTION

[0019] The present invention is further described below in conjunction with embodiments. The description of the following embodiments is only used to help understand the present invention. It should be noted that for ordinary persons in the art, without departing from the principle of the present invention, the present invention can also be modified in some ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0020] Embodiment 1 As an embodiment, the offshore wind turbine pipe pile enlarged cross-section-solidified soil scour protection structure includes solidified soil 32 , a pile bottom protection structure and reinforced steel piles 6 .

[0021] like Figure 1 As shown, the solidified soil 32 is poured into the scouring pit 13 at the bottom of the wind turbine pile 11 by a solidified soil pouring device; the upper surface of the solidified soil 32 is flush with the surface of the seabed 12 around the wind turbine pile 11. When pouring the solidified soil 32, the solidified soil pouring device is fixed on the wind turbine pile 11.

[0022] The pile bottom protection structure includes a double-layer steel sleeve 41, a bottom plate 42, a top plate 43 and a steel casing 44. The double-layer steel sleeve 41 is fixed on the bottom plate 42, the steel casing 44 is fixed on the bottom plate 42, and the top plate 43 is fixed on the top of the double-layer steel sleeve 41. A steel mesh 48 is provided in the double-layer steel sleeve 41 and micro-expansive cement slurry 52 is poured. The double-layer steel sleeve 41 is hooped at the bottom of the fan pipe pile 11 and supported on the poured solidified soil 32.

[0023] A circular floating block 45 is arranged in the steel casing 44. The circular floating block 45 can effectively prevent the pile bottom protection structure from sinking into the water before the double-layer steel casing 41 is welded into a ring, the steel mesh 48 is tied and fixed, and the top plate 43 is welded and fixed. The circular floating block 45 is pulled out after the above structures are completed, so that the pile bottom protection structure sinks into the seabed 12 and is hooped at the bottom of the wind turbine pile 11.

[0024] The reinforcement steel pile 6 passes through the steel casing 44 on the pile bottom protection structure, and the bottom end penetrates the solidified soil 32 in the scouring pit 13 and is driven into the seabed 12 .

[0025] Embodiment 2 As another embodiment, this embodiment 2 proposes, based on the embodiment 1, a more specific offshore wind turbine pipe pile with increased cross-section and solidified soil scour protection structure: like Figure 2 As shown, the solidified soil pouring device includes an inner hoop 21, an outer hoop 23, a support rod 25, a pulley 26 and a positioning sleeve 27; the inner hoop 21 is semicircular, two inner hoop 21 are sleeved on the fan pipe pile 11, a channel steel track 22 is arranged around the outer side of the inner hoop 21, the outer hoop 23 is annular, and the outer hoop 23 is sleeved on the outer side of the inner hoop 21, one end of the support rod 25 is fixed to the outer hoop 23, and the other end is provided with a pulley 26, the pulley 26 is supported in the channel steel track 22, and the positioning sleeve 27 is fixed vertically on the support rod 25 at equal intervals. A pouring pipe 31 is arranged in the positioning sleeve 27 of the solidified soil pouring device, and the solidified soil 32 is poured into the scouring pit 13 through the pouring pipe 31.

[0026] The solidified soil pouring device is provided with a foam float 24 and an ultrasonic probe 28, and the foam float 24 is arranged along the inner circumference of the outer hoop 23. The foam float 24 is provided to provide buoyancy to prevent the solidified soil pouring device from sinking into the water; the ultrasonic probe 28 is fixed under the support rod 25, and the pouring condition of the scouring pit 13 is detected by the ultrasonic probe 28 to avoid uneven pouring of the solidified soil 32.

[0027] like Figures 3 to 8 As shown, the double-layer steel sleeve 41, the bottom plate 42 and the top plate 43 each include two symmetrical semi-annular structures, and the outer end of each semi-annular structure of the double-layer steel sleeve 41 is provided with a docking ear plate 46, and the two annular structures of the double-layer steel sleeve 41 are spliced ​​and fixed to each other through the docking ear plate 46.

[0028] The top plate 43 is provided with a grouting hole 47 , which is connected to a grouting pipe 51 , and a slightly expansive cement slurry 52 is injected into the double-layer steel sleeve 41 through the grouting pipe 51 .

[0029] It should be noted that the parts in this embodiment that are the same or similar to those in the first embodiment can be referenced to each other and will not be described in detail in this application.

[0030] Embodiment 3 As another embodiment, this embodiment 3 proposes, based on the embodiments 1 and 2, a construction method of the offshore wind turbine pipe pile enlarged cross-section-solidified soil scour protection structure, including the following construction steps: Step 1: Install and fix the solidified soil pouring device: install the inner hoop 21 on the fan pile 11, then put the outer hoop 23 on the outside of the inner hoop 21, and support the pulley 26 in the channel steel track 22, and then insert the pouring pipe 31 into the water from the positioning sleeve 27 respectively.

[0031] Pouring of the solidified soil 32 in the scouring pit 13: The solidified soil 32 is pumped into the scouring pit 13 at the bottom of the seabed 12 through the pouring pipe 31, and the ultrasonic probe 28 is turned on to detect the depth of the scouring pit 13. When the scouring pit 13 is deeper, the pumping amount of the solidified soil 32 in the pouring pipe 31 is increased, and when the scouring pit 13 is shallow, the pumping amount of the solidified soil 32 in the pouring pipe 31 is reduced, so that the poured solidified soil 32 in the scouring pit 13 is flush with the surface of the seabed 12; the outer clamp 23 is rotated along the wind turbine pipe pile 11 until the scouring pit 13 is filled and leveled, and then the solidified soil pouring device is removed from the wind turbine pipe pile 11.

[0032] Step 2: Installation of double-layer steel sleeve 41: Figure 5 As shown, two semi-arc double-layer steel sleeves 41 are sleeved on the fan pile 11 and temporarily fixed by docking ear plates 46, and then the double-layer steel sleeves 41 and the bottom plate 42 are welded into a ring; Installation of the steel mesh 48: Install the binding steel mesh 48 in the double-layer steel sleeve 41; Installation of the top plate 43: Weld two semi-annular top plates 43 to the top of the double-layer steel sleeve 41 .

[0033] Step 3: Installation of grouting pipe 51: Fig. 9 and Fig.10 As shown, the grouting pipe 51 is installed on the grouting hole 47 of the top plate 43, the grouting pipe 51 is plugged and connected to the grouting hole 47, and then the circular floating block 45 in the steel casing 44 is pulled out, and the pile bottom protection structure is sunk into the seabed 12 along the wind turbine pipe pile 11 and is hooped at the bottom of the wind turbine pipe pile 11.

[0034] Step 4, injection of micro-expansive cement slurry 52: inject micro-expansive cement slurry 52 into the double-layer steel sleeve 41 through the grouting pipe 51. The micro-expansive cement slurry 52 is injected according to the principle of dual control of pressure and flow. The grouting operation can only be stopped and the grouting pipe 51 can be pulled out after the pressure and flow exceed the design values.

[0035] Step 5: driving the reinforcement steel piles 6 : after the micro-expansive cement slurry 52 reaches the designed strength, the reinforcement steel piles 6 are passed through the steel casing 44 and driven into the seabed 12 .

[0036] It should be noted that the parts in this embodiment that are the same or similar to those in Embodiments 1 and 2 can be referenced to each other and will not be described in detail in this application.

[0037] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

Claims

1. A construction method for an offshore wind turbine pipe pile with increased cross-section and solidified soil scour protection structure, characterized in that: The construction steps include: Step 1: Install and fix the solidified soil pouring device: install the solidified soil pouring device on the wind turbine pile, and pump the solidified soil into the scouring pit at the bottom of the seabed through the pouring pipe; Step 2: Double-layer steel sleeve installation: Put the double-layer steel sleeve in the pile bottom protection structure on the fan pile, weld the bottom plate at the bottom of the double-layer steel sleeve, install the steel mesh inside, and weld the top plate on the top; Step 3: Installation of grouting pipe: install the grouting pipe on the grouting hole of the top plate, extract the circular floating block, and sink the pile bottom protection structure into the seabed; Step 4: Injecting micro-expansion cement slurry: injecting micro-expansion cement slurry into the double-layer steel sleeve through the grouting pipe; Step 5: Driving reinforcement steel piles: Pass the reinforcement steel piles through the steel casing and drive them into the seabed.

2. The construction method of the offshore wind turbine pipe pile enlarged cross-section-solidified soil scour protection structure according to claim 1 is characterized in that: In step one: the solidified soil pouring device includes an inner hoop, an outer hoop, a support rod, a pulley and a positioning sleeve; the inner hoop is semicircular, and the two inner hoop are combined with the sleeve hoop on the fan pipe pile. A channel steel track is arranged around the outer side of the inner hoop, and the outer hoop is in a circular ring shape. Then the outer hoop is sleeved on the outer side of the inner hoop, one end of the support rod is fixed to the outer hoop, and the other end is provided with a pulley, and the pulley is supported in the channel steel track. The positioning sleeve is vertically fixed to the support rod, and then the casting pipe is inserted into the water from the positioning sleeve respectively.

3. The construction method of the offshore wind turbine pipe pile enlarged cross-section-solidified soil scour protection structure according to claim 2 is characterized in that: In step one: the solidified soil pouring device also includes an ultrasonic probe, which is turned on to detect the depth of the scouring pit, and the pumping amount of the solidified soil in the pouring pipe is controlled according to the depth of the scouring pit, until the poured solidified soil in the scouring pit is flush with the seabed surface; the outer clamp is rotated along the wind turbine pipe pile until the scouring pit is filled and leveled, and then the solidified soil pouring device is removed from the wind turbine pipe pile.

4. The construction method of the offshore wind turbine pipe pile enlarged cross-section-solidified soil scour protection structure according to claim 1 is characterized in that: Step two is specifically as follows: the pile bottom protection structure includes a double-layer steel sleeve, a bottom plate, a top plate and a steel casing, the double-layer steel sleeve, the bottom plate and the top plate each include two symmetrical semi-annular structures, and the outer end of each semi-annular structure of the double-layer steel sleeve is provided with a docking ear plate; the two symmetrical semi-annular double-layer steel sleeves are put on the fan pipe pile and temporarily fixed by the docking ear plate, and then the bottom plate is welded and fixed at the bottom of the double-layer steel sleeve, and the steel mesh is tied and installed in the double-layer steel sleeve; the top plate is welded to the top of the double-layer steel sleeve.

5. The construction method of the offshore wind turbine pipe pile enlarged cross-section-solidified soil scour protection structure according to claim 4 is characterized in that: The top plate is provided with a grouting hole, the grouting hole is connected to the grouting pipe, and the circular floating block is arranged in the steel casing. The step two is specifically: the grouting pipe is installed on the grouting hole of the top plate, the grouting pipe is plugged and connected to the grouting hole, and then the circular floating block in the steel casing is pulled out, and the pile bottom protection structure is sunk into the seabed along the wind turbine pipe pile, and the hoop is clamped on the bottom of the wind turbine pipe pile.

6. The construction method of the offshore wind turbine pipe pile enlarged cross-section-solidified soil scour protection structure according to claim 1 is characterized in that: In step 4: the injection of micro-expansive cement slurry follows the principle of dual control of pressure and flow, that is, until the pressure and flow exceed the design value, the grouting operation is stopped and the grouting pipe is pulled out.

7. The construction method of the offshore wind turbine pipe pile enlarged cross-section-solidified soil scour protection structure according to claim 1 is characterized in that: In step five: after the micro-expanding cement slurry reaches the designed strength, the reinforcement steel piles are inserted into the steel casing, and the bottom ends of the reinforcement steel piles are driven into the seabed through the solidified soil in the scouring pit.

8. Offshore wind turbine pile enlarged cross-section-solidified soil scour protection structure, characterized in that: Obtained by the method according to any one of claims 1 to 7.

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